对材料和浇铸工艺应作适当选择。
The materials and casting procedure should be chosen properly.
论述球铁高压燃气闸阀的概况、设计要点、壳体浇铸工艺性的改进和试验方法。
The general description, main points of design, technological improvements in valve body casting and test methods of the said valve are discussed.
采用悬浮浇铸工艺并控制冷却速度成功地得到了钢颗粒增强纯铜基铸造复合材料。
Steel grain-reinforced pure copper cast composite was gotten successfully by suspension casting process and controlling the cooling rate.
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